Hey y'all, I found a workaround to have my account "deleted"
I've been trying to delete my Threads account for months, I accidentally enabled it by pressing something on my Instagram, it made the account automatically, and it's tied to my Instagrams Account Center.
I tried to delete it as soon as I noticed, but it required to make a separate Threads password before deleting, this causes a "something went wrong" error after getting the email and typing a password. I couldn't even deactivate, or move my account out of my accounts center.
I changed the username to detach it to myself, and tried almost every week for three months, still with the error. I decided to try something, I went to my Instagram's account center, then 'moved out of my account' from my Instagram, not my Threads.
It then detached my Threads account.
Now having that detached, I still couldn't reset my password, no matter how much I've tried. So I basically randomized my username and other personal info it moved. Blacked everything out, and changed my email to a temp fake email, then deleted the app...
Really hope they made this more streamlined, but posting for visibility, as I had no success with anyone else's 'fixes' and their support was useless. Sorry for the rambling.
TLDR: Move out your INSTAGRAM account, not your Threads account, then use a temp email and forget about it.